hack3r-0m

Get pbcopy and pbpaste in Arch Linux

First you need the 'xsel' package.

$> pacman -S xsel

Then create aliases.

alias pbcopy='xsel --clipboard --input'

alias pbpaste='xsel --clipboard --output'

Previously described at: ERC20 critical problems medium article.

Description.

ERC20 is the most common Ethereum token standard. It should be noted that it is also the first Ethereum's token standard as well.

It is also important that the original ERC20 proposal is a definition of token interface. EIP20 does not define a reference implementation for this token standard. Here is OpenZeppelin implementation of ERC20 token: https://github.com/OpenZeppelin/zeppelin-solidity/tree/master/contracts/token/ERC20

ERC20 token standard implementation assumes two ways of token transferring: (1) transfer function and (2) approve + transferFrom pattern.

Editing remote files in Vim with SSH

Configure SSH

In ~/.ssh/config, include the lines:
```
Host *
ControlPath ~/.ssh/sockets/%r@%h-%p
```

title	subtitle	author	date	source
npm vs Yarn Command Translation Cheat Sheet	CLI commands comparison	yarn	February 15, 2020	https://yarnpkg.com/en/docs/migrating-from-npm

npm vs Yarn Command Translation Cheat Sheet

First Method

Deleting the .git folder may cause problems in our git repository. If we want to delete all of our commits history, but keep the code in its current state, try this:

# Check out to a temporary branch:
git checkout --orphan TEMP_BRANCH

# Add all the files:
git add -A

	worker_processes auto;
	events {
	# Allows up to 1024 connections, can be adjusted
	worker_connections 1024;
	}

	# RTMP configuration
	rtmp {
	server {
	listen 1935; # Listen on standard RTMP port

	function watchEtherTransfers() {
	// Instantiate web3 with WebSocket provider
	const web3 = new Web3(new Web3.providers.WebsocketProvider('wss://rinkeby.infura.io/ws'))

	// Instantiate subscription object
	const subscription = web3.eth.subscribe('pendingTransactions')

	// Subscribe to pending transactions
	subscription.subscribe((error, result) => {
	if (error) console.log(error)

	pragma solidity ^0.4.15;


	contract StringsAndBytes {

	/* --- public variables for storing tests results */
	string public lastTestStringResult; //
	bytes32 public lastTestBytes32Result; //
	bytes public lastTestBytesResult; // bytes: dynamically-sized byte array
	bool public lastTestBoolResult; //

	// This file is MIT Licensed.
	//
	// Copyright 2017 Christian Reitwiessner
	// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
	// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
	// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF O

	# Add the following to your existing VPC CF stack

	# create 2 subnets, lambdas like to be in multiple subnets
	Private1:
	Type: AWS::EC2::Subnet
	Properties:
	VpcId: !Ref VPC
	AvailabilityZone: !Select [ 0, !GetAZs ]
	CidrBlock: !Ref Private1CIDR